How much does snow reduce solar production in Ulster County?

Less than most people expect. A pitched array here sees roughly 6 to 18 days a season with enough cover to stop production — the glass is slick and the array runs warmer than the shingles around it. Cloud cover through November and December costs more production than snow cover does. What snow really drives is the structural spec: design ground snow load here is 30 to 50 psf, and racking must be engineered and stamped for it.

What is the seasonal production curve in Ulster County?

Jul is the strongest month and Dec the weakest, by roughly 3.3 to one. December through February combined account for about 13% of annual output — roughly one month's worth of production spread across three months. A proposal that shows a smooth, near-flat monthly production curve for this county is not modeling this climate.

Is Ulster County too far north or too cloudy for solar?

No, but the honest framing is that the climate sets the ceiling and the electricity rate sets the value. A 10 kW array here produces roughly 12,500 kWh a year. That is real output — the question is what a kWh is worth where you live, which is a rate question rather than a weather one.

Does cold weather help or hurt solar panels in Ulster County?

Cold helps efficiency — panels produce more per unit of sunlight at low temperature, which is why a clear February day can outperform a hazy July one on a per-hour basis. What hurts is daylight hours and cloud cover, and this climate is short on both between November and February. The two effects do not cancel out; the daylight loss dominates.

Hudson Valley · Hudson Valley

Ulster County weather and solar

What the climate here actually does to a solar array — production by season, the structural spec the snow load forces, and the roof decisions that follow from both.

The climate

Hudson Valley

Westchester, Rockland, Orange, Putnam, Dutchess, and the valley floor of Ulster and Columbia. Good sun, high rates, dense tree canopy, and a competitive installer market.

Specific yield

1,180–1,320 kWh / kW-DC / yr

A 10 kW array averages about 12,500 kWh a year here.

Modeled NREL PVWatts v8 · verified Jan 2026

Mean annual snowfall

30–60 inches

No lake-effect exposure.

Modeled NOAA/NWS seasonal snowfall records · verified Jan 2026

Design ground snow load

30–50 psf

Racking and structural review are engineered to this figure. Ask which number your proposal used.

Filed ASCE 7 ground snow load data · verified Jan 2026

Winter quarter share

13% of annual

December, January, and February combined.

Derived NREL PVWatts v8 · verified Jan 2026

Days with snow on the array

6–18 per season

Far fewer than days with snow on the ground — panels shed.

Observed GridReady quote and bill review sample · verified Jan 2026

Seasonality

Production month by month on a 10 kW array

Jul outproduces Dec by roughly 3.3 to one here. This is the shape a real proposal should show you — if yours is a gentle wave, it is not modeling Ulster County.

520

Jan

618

Feb

882

Mar

1,234

Apr

1,470

May

1,528

Jun

1,587

Jul

1,470

Aug

1,234

Sep

941

Oct

529

Nov

488

Dec

kWh per month from a 10 kW-DC array at the midpoint of the Hudson Valley yield band. Bar height is relative to the peak month.

Show the arithmetic

10 kW × 1,250 kWh/kW/yr (midpoint of the Hudson Valley band) = 12,500 kWh a year, distributed on a northern-temperate seasonal curve anchored so December through February sums to 13% of the total.

A modeled shape, not a measurement of your roof. Orientation, pitch, and shading move individual months more than they move the annual total.

Derived NREL PVWatts v8 · verified Jan 2026

Local weather

What the weather here specifically does

Snow is a minor factor here. Tree canopy is the major one — this is some of the most heavily wooded suburban land in the Northeast.
High all-in electricity rates plus good irradiance make this the strongest solar economics in the state outside New York City itself.
Storm outages driven by trees on wires are frequent, which is why the generator market here is mature and aggressive.

The roof

Consequences for the array itself

Tree removal is often the real cost of going solar here, and it is rarely in the initial quote.
Steep-pitched older colonials limit which planes are usable.

The one question worth asking every installer here

“What ground snow load is this racking engineered for, and can I see the stamped calculation?” The right answer in Ulster County is 30–50 psf. A proposal that cannot answer has not been engineered for this roof.

Microclimates

Ulster County is not one climate

County averages hide real variation. These are the other zones inside this county's boundary.

Elevation and distance from a lake move these numbers more than county boundaries do.
Zone	Snowfall	Snow load	Specific yield
Hudson Valley (primary)	30–60"	30–50 psf	1,180–1,320 kWh/kW
Catskills	60–120"	45–80 psf	1,120–1,260 kWh/kW

By location

Elevation across Ulster County

Within a single county, elevation is usually the strongest predictor of how much snow a roof sees.

Place	Elevation	Climate zone	Guide
Kingston	200 ft	Hudson Valley	Costs & production
New Paltz	200 ft	Hudson Valley	Costs & production

Questions

Ulster County climate FAQ

How much does snow reduce solar production in Ulster County?: Less than most people expect. A pitched array here sees roughly 6 to 18 days a season with enough cover to stop production — the glass is slick and the array runs warmer than the shingles around it. Cloud cover through November and December costs more production than snow cover does. What snow really drives is the structural spec: design ground snow load here is 30 to 50 psf, and racking must be engineered and stamped for it.
What is the seasonal production curve in Ulster County?: Jul is the strongest month and Dec the weakest, by roughly 3.3 to one. December through February combined account for about 13% of annual output — roughly one month's worth of production spread across three months. A proposal that shows a smooth, near-flat monthly production curve for this county is not modeling this climate.
Is Ulster County too far north or too cloudy for solar?: No, but the honest framing is that the climate sets the ceiling and the electricity rate sets the value. A 10 kW array here produces roughly 12,500 kWh a year. That is real output — the question is what a kWh is worth where you live, which is a rate question rather than a weather one.
Does cold weather help or hurt solar panels in Ulster County?: Cold helps efficiency — panels produce more per unit of sunlight at low temperature, which is why a clear February day can outperform a hazy July one on a per-hour basis. What hurts is daylight hours and cloud cover, and this climate is short on both between November and February. The two effects do not cancel out; the daylight loss dominates.

Next step

Turn this into your own numbers

The climate sets what a roof can produce. Your rate sets what that production is worth, and your roof sets how much of the band you actually get.

Badge key:Filed — from a tariff, statute, or government datasetModeled — from a published model or datasetDerived — calculated by us from the inputs shownObserved — from proposals and bills readers send us

How this page is built

This is a generated page: the structure is shared across locations, the numbers are not. Every figure comes from the source cited beside it, with the date we last checked it. Nothing here is a quote, an appraisal, or tax advice, and none of it is specific to your roof.

Rates and incentive programs change. We re-verify utility tariffs and NYSERDA program status on a rolling schedule and stamp the date on each number rather than on the page, so you can see which specific figures are fresh. Full methodology · Program status tracker · About the Local Energy Playbook

Page content last reviewed April 2026.

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